Form and reenforce for concrete beams



June 19, 1928.

H. H. SEARS FORM AND REENFORCE FOR CONCRETE BEAMS Original Filed June 24, 1926 Patented June 19, 1928.

UNITED. sT-ATES H-ORACE H. SEARS, OF NEW YORK,

, 1,673,955 PAT roFrIc s.

N. 2., 'ASSIGNOR ONE-HALF To EDWIN F, SAMUELS. 7

FORM AND REENFQRCE FOR CONCRETE BEAMS.

Application filed June 24, 1926, Serial No. 118,134. Renewed April 26, 1928;

The invention relates to a concrete beam having a sheet metal reenforce whichacts as a form for the concrete in pouring, being preferably supplen'iente-d by side forms of wood which arc of standard mill sizes and may be used re watedly'. The reenforcing form is of the knock down type capable of being-shipped flat.

The reenforcing form comprises a continuous bottom plate and side plates which are connected to the bottom plate, preferably by hinges, which permit shipping of the shell flat, and are tied to or anchored in the concrete preferably by means of cross bolts whereby the side plates resist, take-up and transmit to the bottom plate stresses of tension and vertical and horizontal shear.

The advantages incident to shipping the beam knocked down and assembling it at the job by means of lou cost labor, using local gravel and. sand, are obvious. In addition to these advantages the structure to be described also has the advantage that in the finished form it gives a concrete beam-so reenforced with structural steel as to transmit and resist, or in engineering parlance. to develop stresses of tension, shear and compression according to the accepted engineering practice. The device provides tor the use of sheet metal for resisting lateral and longitudinal sheer and tension. with an added i'naierial. such as concrete, to resist compression stresses.

1n the accompanying drin-ving I have. illustrated a. knock down form and rceuforce and completed concrete beam embodying the features of my invention in the preferred form.

In the drawing:

Figure l is a top plan view of the reenforce and form on a reduced scale, the same being set up for pouring and including the side forms or boards for closing and completing the reenforce as a form.

Figure 2 is a top plan View of the completed beam.

Figure 3 is a side elevation of the same, all said figures being broken away at intervals to make the. length indefinite and for convenience of illustration.

Figure 4 is a cross section on an enlarged scale taken on the. line 44 in Figure 3.

Figure 5 is a similiar section on the line 55 of Figure 3.

Figure 6 is a section corresponding to Figure 5 showing a modified-form of hinge.

Figure? isan end view of the form of Figures 1 to 5 knocked down.

Figure 8 is an end view of the shell, Figure 6, knocked down, and-folded for shipment. Q Y

Referring to the drawings by numerals each ofwhich is used to indicate the same or similar parts in the different figures, the metal reenforceing torm, as shown; comprises a continuous bottom plate 1 extending the entire-length of the beam, being of a width equal to the full width of the beam and of suitable-material and thickness to take up and resist with a suitable factor of safety, the tension stresses at the bottom of the beam. This bottom plate is supplemented by side plates 2 connected to the bottom plate at each side and in operative position extending upwardly therefrom at right angles thereto. The side plates are preferably placed two at each end and at intervals throughout the length of the beam, and are preferably of a depth equal to the vertical dimension of the finished beam.

For convenience in shipping the side plates are connected to the bottom plate by means of hinges 3, 3, Figure 5, so that the shell can be shipped flat as indicated in Figure 7 and in modified form in Figure 8, the right hand hinges 5 in Figure 6 liming turned down in the modified formso that the side plates on one side can be turned downwardly under the bottom plate in shipping, the side plate on the other side being turned over on top of the bottom plate as indicated in Figure 8.

The side plates, a. shown, are apertured near the top and bottom or in any suitable arrangement at 6 to receive ('ross'bolts 7 which extend horizontally across the beam connecting the plates together and anchoring them to the concrete, serving to effectively transmit to the bottom plate the tension stress due to the tendency of the beam to bend and also to take up and transmit to the metal shell all shearing stresses, the compression stresses being most effectivelyresrsted by the concrete, the word concrete being used for convenience, it being understood that any other available plastic. may be substituted within the scope of the invention. The ends of the molds may be closed by mea l Ii of wooden or other blocks 12 secured by screws or nails 14 driven throughholes in the side plate or many suitable manner as by contact with other parts of the structure.

In accordance with the practice in connection with the invention the reentorcing forms are shipped knocked down, preferab y fiat as illustrated in Figures 6 and T, to the locality of construction where they may be set up as indicated in Figure l with stand-- ard mill sizes of boards 8 closing the gaps between the side plates. These boards may be secured by the end bolts 7, or more particularly by the nuts 9 thereon, and may be used over and over again, being removed when the concrete has reached a nont'luid set.

The advantages of the invention incident to shipping the reentorcing form in this way, i. e., knocked down, in which condition it occupies a small fraction only of the space taken up by the entire beam, thus saving a very large proportion of the shipping charge for completed beams, using local sand and gravel and local labor, as compared to shipping completed beams or using concrete beams constructed in place, but with the regular form lumber which is expensive both in lirst cost and in carpenter work, are obvious, the structure of the invention being easily and sastisfactorily assembled by imskilled labor.

The completed beam as described also ha.-; the advantage that constructed as described, the stresses are distributed. developed and resisted most efficiently and in accordance with the best engineering practice. particular reference being had to the continuous bottom plate connected at intervals throughout its length to the concrete filler by the hinged side plates which a re anchored to the concrete at short interv; ls by cross bolts.

l have thus described specifically and in detail preferred embodiments of my invention in order that. the nature and operation of the same may be clearly lHltlt-lsifintl. howevervthc specilic terms herein are used descriptively rather than in a limiting sense,

- plates, hinges connecting the side plates to the lateral edges ofthe bottom plate at in tervals, the side plates being spaced apart. in the'direction of the length of the beam, and through bolts connecting the opposite side plates together.

2. A 'reenforce for concrete beams adapted to be used as a mold, comprising a continuous bottom plate, side plates hinged thereto and forming the sides of the form, and cross bolts connecting the opposite side plates through the concrete.

3. A reenforce for concrete. beams comprising a bottom plate, side plates foldably connected thereto at intervals and spaced apart in the direction of the length of the beam, and cross bolts comiecting the side plates through the concrete.

4. A reenforce. for concrete beams adapted to serve as a mold comprising a'continuous bottom plate. side plates foldably connected thereto at intervals and spaced apart in the direction of the length of the beam, cross bolts connecting the side plates through the concrete, and removable means for closing the space between the side plates. the s:. me being connected to the side plates by the cross bolts.

A reenforce for concrete beams comprising a bottom plate, side plates on each side of the bottom plate, hinges connecting the side plates to the bottom plate. bolts connecting the opposite side plates through the concrete, the hinges on one side being turned downwardly and on the other side being turned upwardly so that. the side plates can be folded on oppo5-aite sides ol' the bottom plate.

Signed by this 21st day me at New York city. N. Y., ot June, 1926.

HORACE H. SEARS. 

